Universal stud puller and driver



July 10, 1951 R. A. VALVANO' 2,560,012

UNIVERSAL STUD FULLER AND DRIVER Filed Nov. 1, 1946 FIG I FIG 3 5 |4 '5 4o 4 g 4 L i INVENTOR RALPH A. VALVANO BY M ATTORNEYS Patented July 10, 1951 UNITED STATES PATENT OFFICE UNIVERSAL STUD PULLER AND DRIVER Ralph A. Valvano, Los Angelcs, Calif. Application November 1, 1946, Serial No. 707,273

2 Claiins. 81-53) This inventionrelates generally to tools and is particularly concerned with tools used for manipulating stud bolts to insert them or remove them from a work piece, commonly known as stud drivers and stud pullers. I

The tool herein disclosed represents an improvement over the tool set forth in my copending application for patent on a Stud Puller and Driver, Serial No. 673,911, filed June 3, 1946.

Tools presently in use for removing studs from members in which they have been mounted for a considerable length of time have many disadvantages. Some are useful only as tools for m serting or driving the stud bolt into the work and cannot be used to pull or remove studs. On the other hand, others are useful merely as a tool for removing stud bolts. All pulling tools with which I am familiar tend tomar the threads on the bolt unless the same is mounted very loosely. It is also true that most of the tools presently in use are capable of engaging only the threaded part of the bolt, while in many instances it is desirable to have a tool capable of grasping the smooth portion of a bolt. I

It is a primary object of this inventionto provide a novel tool useful both as a stud puller and as a driver. In this connection it is an object to provide a tool which is effective to grasp or firmly engage either the threaded part or the smooth part of a stud bolt or the like so that the tool may be rotated and cause rotation of the bolt therewith.

It is a particular object of the invention to provide a tool of the type indicated which is easily adjustable for grasping a smooth portion or a threaded portion of the bolt for use either as a puller or a driver.

It is a further object of the invention to provide a device of the type indicated which will not render the threads of the bolt unusable.

It is a still further object of the invention to provide a tool for the uses indicated which does not embody any parts which can come loose and which readily slips over or onto a stud bolt to the desired place and is quickly adjustable or movable to engage the bolt at such place.

These and other objects will be apparent from the drawing and the following description thereof. Referring to the drawing, which is merely for illustrative purposes:

Fig. 1 is a sectional elevation of a tool embodying the invention shown with relation to a stud bolt to be removed from a member in which the same is embedded;

Fig. 2 is a sectional plan view on line 22 of Fig. 1;

Fig. 3 is a view similar to Fig. 1 but showing the tool engaging the smooth part of a bolt;

Fig. 4 is a section on line 44.of Fig. 3;

Fig. 5 is a perspective view of the locking means for gripping the threaded portion of a stud bolt; and

Fig. 6 is a perspective view of the locking means for gripping the smooth portion of a bolt.

More particularly describing the invention, reference numeral l0 generally indicates the device of the invention which'is shown positioned on a stud bolt 1 I mounted in a member 12. The device includes a body member M which is shown as being hexagonal in shape to facilitate the application of a Wrench or other tool thereto to turn it. However, the exterior of the body might be made in any suitable shape.

The body is provided with a central opening therethrough which is generally .indicated by numeral [5. Theupper end of this opening is relatively large in cross sectional area compared to the bolt to be received. The lower end of the opening I5 is relatively smaller in size, being bounded on one end by an arcuately disposed threaded wall surface 22. The size of the lower portion of the opening I5 is large enough to freely accommodate the stud bolt 1 I so that the body 14 may be readily slipped over the projecting end of the bolt to the desired point. 7

Two locking devices are provided for gripping the stud bolt. One of these, generally indicated by numeral 25, is. designed for gripping the threaded portion of a bolt and is designed to be positioned in the restricted portion of the opening 15. The body is provided with a transverse slot or opening 26 to accommodate the locking device. The outer boundary'of the slot is recessed into the side wall of the body, as indicated at 26'; however, this is not essential.

The lockin device or means for gripping the threaded portion of the bolt comprises a solid member 21 having an arcuate recess 28 which is grooved or threaded to correspond to the threaded area 22. In addition, each of the threads is provided with a roughened surface as shown to insure a gripping engagement with the threads of the bolt. The member 21 is curved at 28 on its outer surface in such a manner that the same becomes increasingly thick from theinner end 30 to a point on the outside which is past a point opposite the center of the grooved recess 28. The member is also provided with an outer end portion 3| which is apertured at 32 to accommodate a chain 33 by means of which the member is secured to the body M, the other end of the chain being mounted on the member by means of the screw 34.

In the operation of the device, assuming that it is desired to grip the bolt where it is threaded, the tool is first slipped over the end of the bolt s to the desired point, as for example the position in which it is shown in Fig. 1, and then, depending upon whether the threads are right hand or left hand, the locking device 25 is inserted in the slot 26 from the appropriate side. Thus, for example, if the bolt is provided with right hand threads, such as shown in the draw.- ing, and it is desired to rotate the bolt counterclockwise, the parts are brought into the position in which they are shown in Figs. 1 and 2. Rotation of the tool in a counterclockwise direction will then serve to firmly wedge the locking device 25 into the space between the outer boundary 2B of the slot 26 and the side of the bolt and the tool may be used for rotating the bolt.

If it is desired to rotate the bolt in an opposite direction, it is only necessary to insert the locking device 25 from the other side of the slot 26 and move it into firm engagement with the bolt.

As heretofore indicated, the tool may also be used for gripping the smooth portion of a bolt and in order to accomplish this the tool is provided with a locking device 35 which comprises a member 36 which is recessed at31 on the same radius as the bolt to be gripped. This recess has a roughened surface as shown. The outer edge 38 of the member is curved and the same increases in thickness from the inner end to a point opposite the outer end of the recess. The member 35 is received in a slot or opening 41! of the body hi located in the region of the upper portion of the opening l5. The outer end 42 of the member 35 is apertured at 43 to accommodate a chain 44 mounted on the screw 34.

Assuming that it is desired to grip the smooth portion of the bolt, the tool is slipped over the bolt to the desired point, as shown in Fig. 3, to bring the smooth portion thereof opposite the slot 40. The locking device 35 is then inserted from the appropriate side and forced into engagement with the bolt, as indicated in Fig. 4, where it is evident that if the tool is turned in a clockwise direction the wedge will become firmly wedged into the space between the outer limits of the slot or opening 40 and the periphery ofthe bolt and the parts may be turned as one piece.

It is a particular feature of the invention that each of the locking devices is provided with a recessed face. With this construction, maximum gripping of the bolt is effected with a minimum marring thereof. As a result, bolts that are removed may be reused.

Although the invention has been shown and described with reference to a particular embodiment thereof, it is contemplated that various changes and modifications can be made without departing from the scope of the invention, as set forth in the claims.

I claim:

1. A tool for use as described, comprising a body having a bolt receiving opening extending therethrough, said opening being of greater cross sectional area than the bolt to be received therein, said body having screw threads formed partially around said opening for a limited extent of the length of said opening, said body having a transversely extending opening intersecting said bolt receiving opening in a region opposite to the part thereof provided with screw threads, and a wedge shaped locking element movably mounted in said transversely extending opening, said locking element having an arcuately recessed surface adapted for engagement with a bolt in said bolt receiving opening for preventing relative rotation of said body and said bolt.

2. A tool for use as described, comprising a body having a bolt receiving opening extending therethrough, said opening being of greater cross sectional area than'the bolt to be received therein, said body having screw threads formed partially around said opening for a limited extent of the length of said opening, said body having a transversely extending opening intersecting said bolt receiving opening opposite said threads, and a wedge locking element adapted to be received in said transverse opening, said element having an arcuately recessed grooved face for engaging a bolt, the grooves of said face corresponding in cross-sectional size and shape to the threads of the bolt to be gripped.

RALPH A. VALVANO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 661,901 Alaman Nov. 13, 1900 1,195,901 Barrett Aug. 22, 1916 1,813,424 Roche July '7, 1931 FOREIGN PATENTS Number Country Date 10,489 Great Britain May 28, 1895 888,024 France Aug. 30, 1943 

